I dont know if its that subjective. Good music has a couple of traits like originality and suprize that objectivly distincts itself from rubbish music (doesnt mean rubbish music cant please people).
Your definition of "great" music is subjectively different than anyone else's. True there's a fine line between Bach and new age "riff-raff", but in other areas the boundaries are unclear. For example, music is like poetry. I may say I like a Keats poem and you may counter by offering a Lord Byron lyric; One is not necessarily "better" then the other. On the other hand a lesser known poet may write something that speaks to the heart and soul of a particular reader. Among literary circles and academia, the piece is considered a product of the times, one that holds little value. The beauty of the piece, however, lies in the eye of the beholder, no matter its innumerable deficiencies, according to us. How can we say something is "rubbish" when it means so much to so many? That "classical" piece may be, by anyone who knows anything about music, infinitely, better in all aspects, but a simple "unoriginal" piece according to you may motivate a young child to learn to play the piano who, after years of experiences comes to appreciate "classical music". Had they never heard the "rubbish" and gone strait to music many consider to be perfection, they may have been unmotivated to even take up an instrument. Some music is universally sublime, some piece's are technically masterful, and some just speak to the heart. Who are we to discredit such powerful forces motivating the sentient and mysterious interstices of thought and emotion that guide and prod our fellow man?
It's not a matter of "pleasing" them with "rubbish" music, but of "guiding" them toward "great" music, using the agent of subjective emotional satisfaction, to obtain that higher stairway where the gods of music have passed, resurfaced, and impressed their ingenuity among countless aspirers to those divine, unadulterated tones